通过吸积形成大质量恒星系统
太阳与恒星天体物理
2011-02-21 v1 星系天体物理
摘要
大质量恒星产生如此多的光,以至于它们对周围气体和尘埃施加的辐射压力强于其引力吸引,长期以来人们一直认为这种情况会阻止它们通过吸积增长。我们展示了高质量前恒星核坍缩的三维辐射流体动力学模拟,并发现辐射压力并未阻止吸积。相反,引力不稳定性与瑞利-泰勒不稳定性通过非轴对称盘和纤维丝将气体引导到恒星系统上,这些盘和纤维丝对辐射进行自屏蔽,同时允许辐射通过光学薄的泡囊逃逸。引力不稳定性导致盘碎裂,并在主星周围形成一个质量较大的伴星。辐射压力并不限制恒星质量,但允许吸积持续进行的不稳定性会导致形成小质量的多星系统。
引用
@article{arxiv.0901.3157,
title = {The Formation of Massive Star Systems by Accretion},
author = {Mark R. Krumholz and Richard I. Klein and Christopher F. McKee and Stella S. R. Offner and Andrew J. Cunningham},
journal= {arXiv preprint arXiv:0901.3157},
year = {2011}
}
备注
Accepted by Science. 28 pages, 8 figures, Science manuscript format, includes both main text and supplementary online material. Figure resolution severely degraded to fit within size limits. For movie and full resolution figures, see http://www.ucolick.org/~krumholz/publications.html